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Reports function calls with the <code>Deferred</code> result type if the return value is not used.
<p>If the <code>Deferred</code> return value is not used, the call site would not wait to complete this function.</p>
<p><b>Example:</b></p>
<pre><code>
  fun calcEverythingAsync() = CompletableDeferred(42)

  fun usage() {
      calcEverythingAsync()
  }
</code></pre>
<p>The quick-fix provides a variable with the <code>Deferred</code> initializer:</p>
<pre><code>
  fun calcEverythingAsync() = CompletableDeferred(42)

  fun usage() {
      val answer = calcEverythingAsync()
  }
</code></pre>
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